CN211999857U - System for high carbon ferrochrome is smelted and is dealt with stainless steel dirt mud in coordination - Google Patents
System for high carbon ferrochrome is smelted and is dealt with stainless steel dirt mud in coordination Download PDFInfo
- Publication number
- CN211999857U CN211999857U CN202020645053.XU CN202020645053U CN211999857U CN 211999857 U CN211999857 U CN 211999857U CN 202020645053 U CN202020645053 U CN 202020645053U CN 211999857 U CN211999857 U CN 211999857U
- Authority
- CN
- China
- Prior art keywords
- stainless steel
- unit
- mud
- dust
- smelting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
The utility model relates to an environment is administered and metallurgical solid waste resource utilizes the field, especially relates to a system of stainless steel dirt mud is dealt with in coordination in high carbon ferrochrome smelting, including chromium ore material unit, auxiliary material unit, combination reductant unit, stainless steel dirt mud preprocessing unit, batching unit, furnace charge pre-heating device, ore-smelting electric stove, gas purification device, coal gas recovery and distributor and dust recovery device. The utility model discloses under the prerequisite that does not increase electric stove smelting equipment, not only realized the purpose that stainless steel dirt mud harmlessness was dealt with, but also recovered usable metallic element, especially nickel and chromium element's recycle has practiced thrift manufacturing cost in the dirt mud, has produced better social and economic benefits.
Description
Technical Field
The utility model relates to an environmental management and metallurgical solid waste utilization field especially relates to a system of processing stainless steel dirt mud in coordination is smelted to high carbon ferrochrome.
Background
In the production and smelting process of stainless steel, dust and mud collected by an environment-friendly dust removal facility mainly comprise fly ash collected by a dry bag-type dust remover and waste such as dust and mud collected by a wet method. Due to the presence of C in the dust and mud6+The ionic compound belongs to chromium-containing hazardous waste in national hazardous waste catalogues.
Such waste materials, if not disposed of harmlessly, can pose a serious environmental hazard. On the other hand, the waste contains high content of metal elements such as Ni, Cr, Zn, Fe and the like, and has high industrial utilization value. The resource utilization of the part of metallurgical waste is the requirement of environmental protection and the requirement of social sustainable development and realization of circular economy.
At present, for the resource utilization of the hazardous wastes, after ball-making roasting high-temperature pre-reduction harmless treatment is adopted, a special electric recovery furnace device is adopted for smelting to prepare an alloy product, and a better metal element recovery rate can be still obtained, so that the aim of resource utilization of the hazardous wastes is fulfilled.
However, the premise of adopting the method is to invest in constructing a ball-making roasting pre-reduction production line and a special hazardous waste recovery smelting electric furnace system. The method is only suitable for large stainless steel production enterprises to build factories and dispose themselves or build hazardous waste disposal centers.
The high-carbon ferrochrome product is a main material required by stainless steel production, and is prepared by smelting chromium ore by a flux carbothermic process by adopting submerged arc furnace equipment in iron alloy production enterprises, while dust and mud generated in the stainless steel production process mainly contain metal elements such as nickel, chromium, iron, zinc and the like, and the nickel, chromium and iron elements are necessary components of the stainless steel. Meanwhile, the fly ash generated by the submerged arc furnace during the production of high-carbon ferrochrome contains high chromium element, and belongs to hazardous waste in the national hazardous waste catalogue (code HW 315-002-21).
In recent years, with the implementation of the capacity policy of the steel industry in China, the capacity of domestic high-carbon ferrochrome is generally surplus, and the utilization rate of ore-smelting equipment for producing high-carbon ferrochrome is only 60-70%. Therefore, under the premise of not increasing new investment, the excess production capacity of high-carbon ferrochrome production, namely submerged arc furnace equipment is utilized to cooperatively treat dust and sludge waste of a stainless steel plant and fly ash generated in the process of producing high-carbon ferrochrome products in the process of producing the high-carbon ferrochrome products, and very practical economic benefits and social benefits are achieved.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the system for cooperatively treating the stainless steel dust and sludge by smelting the high-carbon ferrochrome in the submerged arc furnace can realize the resource utilization of the stainless steel dust and sludge and simultaneously treat fly ash waste (code HW315-002-21) generated in the production process of the high-carbon ferrochrome on the premise of not increasing new electric furnace smelting equipment so as to realize the purposes of high-efficiency utilization of waste resources and no secondary pollution to the environment.
In order to solve the technical problem, the utility model discloses a technical scheme be:
the system comprises a chrome ore raw material unit, an auxiliary raw material unit, a combined reducing agent unit, a stainless steel sludge pretreatment unit, a batching unit, a furnace charge pre-heating device, an ore-smelting electric furnace, a flue gas purification device, a coal gas recovery and distribution device, a dust recovery device and a slag water crushing device, wherein discharge ports of the chrome ore raw material unit, the auxiliary raw material unit, the combined reducing agent unit and the stainless steel sludge pretreatment unit are all connected with a feed port of the batching unit, a discharge port of the batching unit is connected with a feed port of the furnace charge pre-heating device, a discharge port of the furnace charge pre-heating device is connected with a feed port of the ore-smelting electric furnace, a flue gas discharge port of the ore-smelting electric furnace is connected with an air inlet of the flue gas purification device, and a gas outlet of the flue gas purification device is respectively connected with an inlet of the coal gas recovery and distribution device and an inlet of the dust recovery device, the outlet of the coal gas recovery and distribution device is respectively connected with the stainless steel dust and mud pretreatment unit and the furnace charge preheating device, the outlet of the dust recovery device is connected with the stainless steel dust and mud pretreatment unit, and the discharge port of the submerged arc furnace is connected with the slag water crushing device.
In an optional embodiment, the system for the high-carbon ferrochrome smelting synergistic treatment of the stainless steel dust and mud further comprises a product pouring and packaging device, and the discharge port of the submerged arc furnace is connected with the product pouring and packaging device.
The beneficial effects of the utility model reside in that: the utility model provides a cooperate processing system joins in stainless steel dirt mud when producing high carbon ferrochrome, make stainless steel dirt mud smelt jointly with the supplementary product mix back of high carbon ferrochrome, obtain chromium, nickel, ferroalloy product, the alloy product of production has chromium and the iron element of former high carbon ferrochrome except, still increased the elements that need join in the stainless steel smelting such as nickel, manganese, the stainless steel factory can reduce nickel, manganese, copper (200 is stainless steel) and join in marriage the volume when using the product of this system production and use former high carbon ferrochrome product, corresponding manufacturing cost is lower; the system can be used for producing high-carbon ferrochrome and cooperatively treating the stainless steel dust and mud, and the stainless steel dust and mud belongs to dangerous waste, metal elements such as nickel, chromium, iron and the like contained in the stainless steel dust and mud are not required to be purchased with money, and corresponding subsidies are provided for waste production units, so that produced products are priced according to the component grades of the metal elements, the resource utilization rate is high, the pollution of the dust and mud to the environment is avoided, and the comprehensive economic benefit and the social benefit are good.
Drawings
FIG. 1 is a schematic structural diagram of a system for co-processing stainless steel dust and sludge in high-carbon ferrochrome smelting according to an embodiment of the present invention;
description of reference numerals:
1-a chromium ore feed unit;
2-an auxiliary raw material unit;
3-a combined reductant unit;
4-stainless steel dust and mud pretreatment unit;
5-a dosing unit;
6-furnace charge preheating device;
7-an ore-smelting electric furnace;
8-a flue gas purification device;
9-gas recovery and distribution device;
10-dust recovery device;
11-slag water crushing device;
12-product pouring and packaging device.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Please refer to fig. 1, which is a system for co-processing stainless steel sludge in high-carbon ferrochrome smelting, comprising a chromite raw material unit, an auxiliary raw material unit, a combined reducing agent unit, a stainless steel sludge pretreatment unit, a batching unit, a burden charging pre-heating device, an ore-smelting electric furnace, a flue gas purification device, a gas recovery and distribution device, a dust recovery device and a slag water crushing device, wherein discharge ports of the chromite raw material unit, the auxiliary raw material unit, the combined reducing agent unit and the stainless steel sludge pretreatment unit are all connected with a feed port of the batching unit, a discharge port of the batching unit is connected with a feed port of the burden charging pre-heating device, a discharge port of the burden charging pre-heating device is connected with a feed port of the ore-smelting electric furnace, a flue gas discharge port of the ore-smelting electric furnace is connected with an air inlet of the flue gas purification device, an air outlet of the flue gas purification device is respectively connected with an inlet, the outlet of the coal gas recovery and distribution device is respectively connected with the stainless steel dust and mud pretreatment unit and the furnace charge preheating device, the outlet of the dust recovery device is connected with the stainless steel dust and mud pretreatment unit, and the discharge port of the submerged arc furnace is connected with the slag water crushing device.
From the above description, the beneficial effects of the present invention are: the chromium ore raw material unit, the auxiliary raw material unit, the combined reducing agent unit, the smoke purification device, the coal gas recovery and distribution device, the dust recovery device and the slag water-crushing device adopt the raw materials, the reducing agent facility and the waste gas treatment facility corresponding to the high-carbon ferrochrome smelted by the original submerged arc furnace, the stainless steel dust mud pretreatment unit and the furnace charge preheating device can also adopt the existing high-temperature harmless pretreatment equipment to meet the requirements of proportioning, mixing, pelletizing, drying and high-temperature pre-reduction of the dust mud, the furnace charge preheating device recycles the coal gas generated by the submerged arc furnace after passing through the smoke purification device and the coal gas recovery and distribution device, the chromium ore, the stainless steel dust mud after pre-reduction, the auxiliary raw materials, the combined reducing agent and the like are fed into the proportioning unit to be proportioned, then the mixture is preheated and finally fed into the submerged arc furnace to be smelted, thus, the synergistic treatment effect of the, the purpose of reducing power consumption is achieved.
Further, the system for cooperatively processing stainless steel dust and sludge through high-carbon ferrochrome smelting further comprises a product pouring and packaging device, and a discharge port of the submerged arc furnace circuit is connected with the product pouring and packaging device.
As can be seen from the above description, the product pouring and packaging device is an existing device in a high-carbon ferrochrome production system, and no additional facility is required, thereby being beneficial to saving the cost.
The reagents and instruments used in the following examples are all commercially available products unless otherwise specified.
Referring to fig. 1, a first embodiment of the present invention: a system for cooperatively treating stainless steel dust and mud in high-carbon ferrochrome smelting comprises a chromium ore raw material unit, an auxiliary raw material unit, a combined reducing agent unit, a stainless steel dust and mud pretreatment unit, a batching unit, a furnace charge pre-heating device, an ore-smelting electric furnace, a flue gas purification device, a coal gas recovery and distribution device, a dust recovery device and a slag water crushing device, wherein discharge ports of the chromium ore raw material unit, the auxiliary raw material unit, the combined reducing agent unit and the stainless steel dust and mud pretreatment unit are all connected with a feed port of the batching unit, a discharge port of the batching unit is connected with a feed port of the furnace charge pre-heating device, a discharge port of the furnace charge pre-heating device is connected with a feed port of the ore-smelting electric furnace, a flue gas discharge port of the ore-smelting electric furnace is connected with an air inlet of the flue gas purification device, and a gas outlet of the flue gas purification device is respectively, the outlet of the coal gas recovery and distribution device is respectively connected with the stainless steel dust and mud pretreatment unit and the furnace charge preheating device, the outlet of the dust recovery device is connected with the stainless steel dust and mud pretreatment unit, and the discharge port of the submerged arc furnace is connected with the slag water crushing device. The system for cooperatively processing stainless steel dust and mud by high-carbon ferrochrome smelting further comprises a product pouring and packaging device, and a discharge port of the submerged arc furnace circuit is connected with the product pouring and packaging device.
The specific operation is as follows: drying the stainless steel dust mud until the moisture content is less than or equal to 12%, and adding pulverized coal or coke powder to prepare dust mud balls; roasting and reducing the dust-mud pellets at the temperature of 800-1200 ℃ to obtain the dust-mud pellets. Preheating a mixed material prepared from dust mud pellets, chromium ore, auxiliary materials and coke to 400-600 ℃; and smelting the preheated mixed material to obtain chromium, nickel and iron alloy products, furnace slag and flue gas, wherein the smelting temperature range is 1500-1700 ℃, and the smelting period range is 2.5-6 h. Sequentially pouring and processing chromium, nickel and iron alloy products to obtain finished products, performing water crushing treatment on furnace slag to obtain water crushed slag, performing purification operation on flue gas to obtain clean air, and performing high-temperature pre-reduction treatment on stainless steel dust mud and pre-heating mixed materials by using the heat energy of the flue gas; and mixing the hazardous waste gas obtained after the flue gas purification with stainless steel dust and mud to prepare dust and mud pellets.
The embodiment of the utility model discloses an embodiment two is:
referring to table 1, the chemical compositions (chemical composition analysis after high temperature pre-reduction treatment) of the 200-series stainless steel dust mud used in this example are as follows:
TABLE 1
Referring to table 2, the chemical compositions of the raw and auxiliary materials for producing high-carbon ferrochrome in this example are as follows:
TABLE 2
Referring to table 3, the quality standards of the nichrome alloy product produced in this example are as follows:
TABLE 3
According to the quality control standard requirements of the alloy products, the chemical components of 200 series stainless steel dust and mud and the chemical components of the raw and auxiliary materials for producing high-carbon ferrochrome, the mixture ratio of the embodiment is calculated by metallurgical ingredients: the ratio of dust mud, chrome ore, silica and coke is 30: 70: 5.7: 17.7.
Please refer to table 4, which shows the recipe for handling 1000 tons of mud in this embodiment:
TABLE 4
Referring to table 5, the chemical compositions of the product produced in this example are:
TABLE 5
The batching in this embodiment is calculated and the batching list is all calculated through the dry basis, and the metallic element rate of recovery is: 95% of Cr and 98% of Fe.
The electric furnace equipment used in this example was a 12500KVA ore furnace for conventional high-carbon ferrochrome production.
This example deals with 1000 tons of 200-series dust and mud, and 1799 tons of high-carbon ferrochrome product with the composition shown in Table 5 can be obtained.
The specific operation steps of this embodiment are:
(1) 1000 tons (dry basis weight) of stainless steel dust and mud of 200 series example shown in Table 1 are mixed with 12% anthracite (fixed carbon 76%, ash 16%, volatile matter 8%) to prepare balls;
(2) sending the prepared dust mud ore balls into a shaft furnace for high-temperature pre-reduction roasting, wherein the roasting temperature is controlled within 900-1200 ℃;
(3) sending the roasted water balls into a dust and mud bin for later use;
(4) setting the baked dust mud pellets, the chromium ore, the silica and the coke pieces according to a batching sheet, and preparing the mixture into mixed charging stock by a PLC computer batching machine;
(5) adding the furnace-entering mixture to about 400 ℃ through a furnace top heater, and feeding the mixture into an ore-smelting furnace through a discharging pipe for smelting;
(6) the smelting temperature is controlled by adjusting the depth of the furnace charge inserted under the electrode of the submerged arc furnace and using electric load, the smelting temperature is 1300-1700 ℃), and the smelting period is 3.5 hours;
(7) tapping, casting the product, finishing and warehousing, and crushing the slag with water.
The third embodiment of the present invention is:
the present embodiment uses the same raw and auxiliary materials as those used in the present embodiment, such as submerged arc furnace equipment, smelting disposal system, chromium ore, silica, and coke breeze.
Referring to table 6, the chemical compositions (chemical composition analysis after high temperature pre-reduction treatment) of the 300-series stainless steel sludge used in this example are as follows:
TABLE 6
Referring to table 7, the chemical compositions of the products produced in this example are:
TABLE 7
According to the table above and the chemical composition table of the raw and auxiliary materials for producing high-carbon ferrochrome in example two, the recipe of this example is as follows by calculation of metallurgical ingredients:
TABLE 8
| Name (R) | Unit of | Number of | Proportioning | Remarks for note |
| 300 series dust mud | T | 1000 | 48.5 | |
| Chromium ore | T | 667 | 32.3 | |
| Ballast stone | T | 133 | 6.5 | |
| Coke cubes | T | 262 | 12.7 | |
| Total up to | T | 2062 | 100 |
The operation procedure of this example is the same as that of the example, and the quality of the final product is as follows:
TABLE 9
Similarly, the 400 series and 500 series stainless steel dust and mud wastes and other corresponding wastes containing metal elements such as chromium, nickel, manganese and the like can be treated by the treatment method of the embodiment, so that the aim of harmless treatment of the stainless steel dust and mud is fulfilled, the available metal elements are recovered, particularly the nickel and chromium elements in the dust and mud are recycled, the production cost is saved, and better social benefit and economic benefit are generated.
To sum up, the beneficial effects of the utility model reside in that: 1) the surplus capacity equipment for producing the high-carbon ferrochrome is fully utilized, and the resource utilization of the stainless steel dust and mud waste can be realized without increasing the investment of electric furnace system equipment; 2) the stainless steel dust and sludge pretreatment unit not only can treat the dangerous waste of the stainless steel dust and sludge, but also can treat the dangerous waste of dust collection ash (code HW315-002-21) generated in the process of producing high-carbon ferrochrome by utilizing the raw ore heating furnace, so that the system for producing the high-carbon ferrochrome by the raw ore heating furnace is more environment-friendly, and resources are more efficiently utilized; 3) the produced nickel-chromium alloy product not only has the chromium and iron elements of the original high-carbon ferrochrome, but also increases the elements required to be added in the smelting of stainless steel such as nickel, manganese and the like, and compared with the original high-carbon ferrochrome product, a stainless steel factory can reduce the adding amount of nickel, manganese and copper (200 series stainless steel) when using the product produced by the system, so that the corresponding production cost is lower; 4) the production system for producing high-carbon ferrochrome and disposing stainless steel dust and mud by the submerged arc furnace has the advantages that the stainless steel dust and mud belongs to dangerous waste, metal elements such as nickel, chromium, iron and the like do not need to be purchased with money, and corresponding subsidies are provided for waste production units, so that produced products are priced according to the component grades of the metal elements, the resource utilization rate is high, the pollution of the dust and mud to the environment is avoided, and the comprehensive economic benefit and the social benefit are good.
The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.
Claims (2)
1. A system for cooperatively treating stainless steel dust and mud in high-carbon ferrochrome smelting is characterized by comprising a chromium ore raw material unit, an auxiliary raw material unit, a combined reducing agent unit, a stainless steel dust and mud pretreatment unit, a batching unit, a furnace charge pre-heating device, an ore-smelting electric furnace, a flue gas purification device, a coal gas recovery and distribution device, a dust recovery device and a slag water crushing device, wherein discharge ports of the chromium ore raw material unit, the auxiliary raw material unit, the combined reducing agent unit and the stainless steel dust and mud pretreatment unit are all connected with a feed port of the batching unit, a discharge port of the batching unit is connected with a feed port of the furnace charge pre-heating device, a discharge port of the furnace charge pre-heating device is connected with a feed port of the ore-smelting electric furnace, a flue gas discharge port of the ore-smelting electric furnace is connected with an air inlet of the flue gas purification device, an air outlet of the flue gas purification device is respectively connected with, the outlet of the coal gas recovery and distribution device is respectively connected with the stainless steel dust and mud pretreatment unit and the furnace charge preheating device, the outlet of the dust recovery device is connected with the stainless steel dust and mud pretreatment unit, and the discharge port of the submerged arc furnace is connected with the slag water crushing device.
2. The system for the high-carbon ferrochrome smelting co-processing stainless steel dust and mud as claimed in claim 1, further comprising a product pouring and packaging device, wherein the discharge port of the submerged arc furnace is connected with the product pouring and packaging device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020645053.XU CN211999857U (en) | 2020-04-26 | 2020-04-26 | System for high carbon ferrochrome is smelted and is dealt with stainless steel dirt mud in coordination |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020645053.XU CN211999857U (en) | 2020-04-26 | 2020-04-26 | System for high carbon ferrochrome is smelted and is dealt with stainless steel dirt mud in coordination |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211999857U true CN211999857U (en) | 2020-11-24 |
Family
ID=73405586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020645053.XU Active CN211999857U (en) | 2020-04-26 | 2020-04-26 | System for high carbon ferrochrome is smelted and is dealt with stainless steel dirt mud in coordination |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211999857U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114990336A (en) * | 2022-06-13 | 2022-09-02 | 李进英 | Preheating reduction device and preheating reduction method |
-
2020
- 2020-04-26 CN CN202020645053.XU patent/CN211999857U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114990336A (en) * | 2022-06-13 | 2022-09-02 | 李进英 | Preheating reduction device and preheating reduction method |
| CN114990336B (en) * | 2022-06-13 | 2023-11-14 | 青岛金能环科技有限责任公司 | Preheating reduction device and preheating reduction method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109468466B (en) | Metallurgical chemical solid waste recycling system and method thereof | |
| CN101942571B (en) | Method for innocently treating and recycling chromium residues and metallurgical waste material | |
| CN100552057C (en) | The cold fixed molten production method of dividing of the direct electric reduction furnace of charcoal pelletizing that contains of vanadium titano-magnetite | |
| CN111411238A (en) | Method and system for cooperatively treating stainless steel dust and sludge through high-carbon ferrochrome smelting | |
| CN110157846B (en) | Method for adding scrap steel into blast furnace in large proportion | |
| CN110465538B (en) | Pre-dechlorination-sintering treatment process for high-chlorine metallurgical waste and incineration fly ash | |
| CN112453009B (en) | Method for green harmless resource utilization of aluminum ash | |
| CN106311718B (en) | A kind of harmlessness disposing and resource utilization method of heavy metal waste | |
| CN101560583A (en) | Converter coolant taking metallurgical waste as raw material and manufacturing method thereof | |
| CN105112663A (en) | Combined production process for high-carbon ferro-chrome and semi-coke | |
| CN104630476A (en) | Method for preparing inconel by using heavy metal sludge | |
| CN109680156A (en) | A kind of waste incineration and generating electricity cinder resourceization utilizes system and method | |
| CN102719575B (en) | Converter steel slag modifier and manufacturing and using methods thereof | |
| CN111020181A (en) | Method for producing limonite pellets | |
| CN211999857U (en) | System for high carbon ferrochrome is smelted and is dealt with stainless steel dirt mud in coordination | |
| CN102851427A (en) | Method for online production of sponge iron by using steel residue waste heat | |
| CN104087703A (en) | Smelting method of schreyerite metalized pellets | |
| CN105219954A (en) | A kind of recoverying and utilizing method of dedusting ash of stainless steel | |
| CN111575492B (en) | Comprehensive treatment method for zinc-containing dust and steel slag | |
| CN101906534B (en) | Raw material processing technology for smelting ferrosilicon in submerged arc furnace | |
| CN215288923U (en) | Stainless steel dust and sludge system for cooperatively treating ferronickel smelting electric furnace | |
| CN110453090A (en) | Steel plant's Zinc-Bearing Wastes electric furnace process recycles zinc oxide system and method | |
| CN210596207U (en) | Zinc oxide system is retrieved to steel plant zinc-containing dust mud electric furnace method | |
| CN106319209B (en) | A kind of rotary hearth furnace processing lead cadmia iron-extracting process | |
| CN105463214A (en) | Method for producing high-nickel iron by adopting low-grade laterite-nickel ores |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |